Advanced Materials for Energy Conversion and Storage VII: Poster Session
Sponsored by: TMS Functional Materials Division, TMS: Energy Conversion and Storage Committee
Program Organizers: Jung Choi, Pacific Northwest National Laboratory; Soumendra Basu, Boston University; Amit Pandey, Lockheed Martin Space; Paul Ohodnicki, University Of Pittsburgh; Kyle Brinkman, Clemson University; Partha Mukherjee, Purdue University; Surojit Gupta, University of North Dakota
Monday 5:30 PM
March 15, 2021
Room: RM 23
Location: TMS2021 Virtual
Session Chair: Soumendra Basu, Boston University; Jung Pyung Choi, Pacific Northwest National Laboratory
A First-principles Study of Silver/Lanthanum Strontium Ferrite Interfacial Adhesion: Jiyun Park1; Yue Qi1; 1Brown University
The contact area between ceramic electrode and metal current collector affects the electrical performance of solid oxide fuel cells (SOFCs); thus, it is of interest to investigate the wettability of metals on ceramic electrode surfaces. In this work, the interface between La0.5Sr0.5FeO3 (LSF55), an intermediate temperature SOFC cathode, and silver (Ag), a current collecting material, was analyzed via first-principles calculations, where the La/SrO- and FeO2-terminations of LSF55(100) surface were considered. The relative stability and the wetting angle of the Ag(100)[011]/LSF55(100) interfaces at different temperatures and under oxygen partial pressure conditions were investigated by comparing the calculated work of separation and work of adhesion.
AgCl-decorated Ag Nanowire Catalysts to Maximize the Surface Effect
in the Oxygen Reduction Reaction
: Suyeon Choi1; Youngtae Park1; Changsoo Lee2; Hyuck Mo Lee1; 1Korea Advanced Institute of Science and Technology, Korea; 2Korea Institute of Energy Research
Pt-based catalysts are suffering from the intrinsic high cost and poor stability for practical use in anion exchange membrane fuel cells (AEMFCs). We developed AgCl-decorated Ag nanowires (AgNWs) to replace Pt-based catalysts using a polyol and precipitation method. Its morphology was studied by energy dispersive spectrometry (EDS) and scanning electron microscope (SEM). Moreover, we wanted to confirm the effect of the large surface area of this bumpy AgCl-decorated AgNWs by comparing it to a catalyst with flat surface. This flat catalyst is synthesized using a galvanic reaction with Cl and the relative surface area was calculated using double layer capacitance (DLC) measurement. Electrochemical measurements showed that catalysts have a higher on-set potential and half-wave potential in the order of AgCl-decorated AgNWs, galvanic AgNWs, and AgNWs. We suggest that AgCl-decorated AgNWs can be used as catalysts in the industry of AEMFCs due to the simple synthesis process and low cost.
Liquid Enhanced Ga-Sn Alloy Anode for RMBs: Jiawei Liu1; Chao Song1; Yuan Yuan1; Dajian Li1; Fusheng Pan1; 1Chongqing University
The major problem of using pure Mg metal as anode of rechargeable magnesium batteries (RMBs) is the passive films formed in interface of anode and the polar organic electrolytes, which can block Mg ion in their migration towards the electrode surface. Therefore, Metallic anodes are proposed as the promising substitutes for a reversible electrode. . In this work, Ga-Sn binary alloys were prepared using a simple method. The high specific capacity, good cycling stability (more than 200 cycles) and great rate capability in conventional electrolyte were observed. The superior electrochemical performance of the Ga-Sn alloy-type anode is attributed to the reversible solid-liquid phase transformation at room temperature during cycling which can significantly improve the transport kinetics of Mg-ion. Meanwhile, the electrochemical mechanism was clarified by Ex-situ X-ray diffraction and transmission electron microscopy. The present investigation provides a new route to the development of metallic anode for magnesium-ion batteries.
MOF-derived Carbon Nanocomposites as a Novel Cathode for Lithium Air Batteries: Hien Pham1; Jong-Won Lee2; Min-Sik Park1; 1Kyung Hee University; 2Daegu Gyeongbuk Institute of Science & Technology
Aprotic lithium-air batteries (LABs) is an attracting alternative energy storage system in the future because of their high theoretical energy density. In aprotic LABs, electrochemical reactions involve the formation of lithium peroxide during the discharge and the recovery of it into oxygen and lithium ion during the subsequent charge. The capacity of LABs largely depends on the ability of the cathode to store the lithium peroxide without hindering the oxygen and lithium ion diffusion. Besides, the redox reactions should be reversible for high efficiency and long lifetime of LABs. Herein, we propose a carbon nanocomposites derived from metal-organic frameworks (MOFs) grown on carbon-nanotubes (CNTs) as a cathode for LABs. The MOF-derived materials provide large pore volume to accommodate the products as well as catalysts for facilitating the electrochemical reactions during the charge and discharge. Meanwhile, CNTs adds more pore and enhance the electrical conductivity of the materials.
Probing Structural Changes of 2D Supercapacitor Electrode by Kelvin Probe Force Microscopy: Kowsik Sambath Kumar1; Nitin Choudhary1; Deepak Pandey1; Yi Ding1; Luis Hurtado1; Hee-Suk Chung2; Laurene Tetard1; Yeonwoong Jung1; Jayan Thomas1; 1University of Central Florida; 2Analytical Research Division, Korea Basic Science Institute
Electrode materials in energy storage devices experience structural and chemical changes during cycling, which influences the long-term stability of the device. Currently there are limited qualitative analysis studies about the phenomenon behind these changes occurring at the electrode. For the first time, a surface analysis tool such as Kelvin probe force microscopy (KPFM) is employed to probe the reason behind capacitance increase of a two-dimensional (2D) electrode during cycling. We investigated the cycling performance of 2D electrode material, tungsten disulfide (WS2) via KPFM and Raman studies. The results revealed that during cycling, strain developed in the WS2 layers due to intercalation/deintercalation of electrolyte ions increased the available electrochemical active sites leading to increased capacitance. This strain led to increased redox charge storage behavior of the electrode during cycling, which was estimated from the capacitance contribution studies. Such qualitative studies will benefit in developing highly efficient and long-lasting energy storage devices.
Synthesis and Electrochemical Performance of Nano Spinel Lithium Manganese Oxide (LiMn2O4) Composite with Functionalized Carbon Nanostructures (CNTs, GNPs & Graphene) by Microwave-Assisted Chemical Coprecipitation Method: Hanan Tariq1; Abdul Shakoor1; Jeffin James1; 1Center for Advanced Materials, Qatar University
This study aims to increase surface area and the number of intercalation sites for lithium ions using the carbon nanostructures (CNTs & GNPs), which in-turns will enhance the electrochemical performance of the cathode material (LMO).Carbon nanostructures (CNTs & GNPs) boost the rate capabilities and cyclic performance of lithium transition metal oxides. The specific capacity at 1 C-rate was 126.4 mAh/g and maintained at 118 mAh/g at 5C rate. Moreover, capacity retention was 90% after 100 cycles. Energy storage systems pose a significant safety concern at a higher temperature and are limited to 30% to 50 % of their potential for safety reasons. The energy storage system from the proposed composites will allow the usage above 50% of the potential, even at higher temperature and discharge rates. The energy storage systems from the composites will resist incendiary and capacity deteriorating reactions.
Temperature-induced Successive Martensitic and Inter-martensitic Phase Transformations of Ni2.15Mn0.85Ga Heusler Alloy: Amila Madiligama1; Pnina Ari-Gur2; Yang Ren3; Vladimir Shavrov4; Victor Koledov4; Yanling Ge5; James George2; 1Penn State DuBois; 2Western Michigan University; 3Argonne National Laboratory; 4Russian Academy of Sciences; 5Aalto University
Ni-Mn-based Heusler alloys have attracted much attention due to their functional properties, such as magnetic shape memory and magnetocaloric effects. The studied alloy, Ni2.15Mn0.85Ga, has shown great potential as a magnetocaloric material (ΔQ = 4900 J/kg at 343 K, and under140 kOe field). Upon cooling, the paramagnetic cubic (L21), austenite transforms into ferromagnetic 7M modulated monoclinic martensite. This phase is stable in a narrow temperature range, and upon cooling, transforms into a non-modulated ferromagnetic tetragonal (L10) phase. The separation between the equilibrium temperatures of the austenitic and tetragonal martensitic phases is only ~50 K. This alloy undergoes reversible temperature-induced martensitic and inter-martensitic phase transformations with thermal hysteresis of about 25 K. The conclusions from the detailed study of the three phases, their phase transformation temperatures, and the thermal hysteresis, open new opportunities to enhance the magnetocaloric effect by utilizing the entropy associated with multi-structural transformations in Ni-Mn-Ga alloys.